Rubinsohl (Rubensohl, Transfer Lebensohl) -
Typically used after opponent overcalls partner's 1 Notrump, Rubinsohl
provides responder a transfer mechanism extending the traditional Lebensohl
treatment. Similar to other transfer mechanisms, Rubinsohl allows the
stronger hand to become declarer, showing length in the implied suit above
the rank of the suit bid.

Transfers to opponents' suit shows a 4 card major in the bid suit (Stayman)
and obvious interest in game. Most advanced Rubinsohl players find the most
profitable treatment of responder's double as a generalized takeout double
bid rather than the penalty double found in Lebensohl.

Unlike
regular Lebensohl, using Rubinsohl when the responder transfers to a suit
above the overcaller's suit is typically played as invitational.

Transfers are on
at 2N and above
2N transfers
opener to 3C, likely a signoff to play.
See next table for more on responder transfers to a suit whose rank is
lower than the rank of the overcall suit.

Stayman

3H/S = fit but no strength4H/S = fit and strength3N = Stopper, no major3D = Denies stopper or major

3C is invitational StaymanIn this example where the opponent overcalled 2D (natural) and
responder is transferring to the opponents' suit, the cuebid is
Stayman.Note: This simple Stayman method implies at responder has a tolerance
for both major suits.